Health Script Smart Peoples Needed :D

Ok so...Im working on a script and i im not super duper pro at lua...atleast not no more..ive used it for cs2d only and havent used it in a year so here is my script..Can you tell me how to stop it from saying attempt to perform arithmetic on Boolean. I know its cause its adding 1 to the player(id,'health') but how do i fix this?